From: Matthieu CASTET <matthieu.castet@parrot.com>
To: Jon Povey <Jon.Povey@racelogic.co.uk>
Cc: Enric Balletbo i Serra <eballetbo@iseebcn.com>,
Javier Martinez Canillas <martinez.javier@gmail.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>
Subject: Re: [RFC] Change ECC algorithm from userspace
Date: Fri, 28 Oct 2011 12:40:03 +0200 [thread overview]
Message-ID: <4EAA8683.4080202@parrot.com> (raw)
In-Reply-To: <70E876B0EA86DD4BAF101844BC814DFE0BF244FAD1@Cloud.RL.local>
Jon Povey a écrit :
> linux-mtd-bounces@lists.infradead.org wrote:
>> I want to be able to use 1-bit ECC for the first partition where I
>> save the loader binary and has to be accessed by the ROM boot but use
>> a 4-bit ECC for my rootfs partition.
>>
>> Does anyone have this same issue?
>
> DM355 and DM365 has similar issues as the RBL expects a different OOB/ECC
> layout to Linux.
>
>> What is the best approach to store data in a NAND device using
>> different ECC techniques?
>
> What I have done is write a utility that calculates ECC and writes to
> the mtd device in RAW mode. So to rewrite the bootloader I take care of
> the ECC and layout at application level without changing the kernel.
>
Note that the kernel raw mode doesn't write the page in one time : it write data
and then ecc. This may cause problem with NOP1 nand.
see http://lists.infradead.org/pipermail/linux-mtd/2010-August/031262.html
Matthieu
WARNING: multiple messages have this Message-ID (diff)
From: Matthieu CASTET <matthieu.castet@parrot.com>
To: Jon Povey <Jon.Povey@racelogic.co.uk>
Cc: Javier Martinez Canillas <martinez.javier@gmail.com>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
Enric Balletbo i Serra <eballetbo@iseebcn.com>
Subject: Re: [RFC] Change ECC algorithm from userspace
Date: Fri, 28 Oct 2011 12:40:03 +0200 [thread overview]
Message-ID: <4EAA8683.4080202@parrot.com> (raw)
In-Reply-To: <70E876B0EA86DD4BAF101844BC814DFE0BF244FAD1@Cloud.RL.local>
Jon Povey a écrit :
> linux-mtd-bounces@lists.infradead.org wrote:
>> I want to be able to use 1-bit ECC for the first partition where I
>> save the loader binary and has to be accessed by the ROM boot but use
>> a 4-bit ECC for my rootfs partition.
>>
>> Does anyone have this same issue?
>
> DM355 and DM365 has similar issues as the RBL expects a different OOB/ECC
> layout to Linux.
>
>> What is the best approach to store data in a NAND device using
>> different ECC techniques?
>
> What I have done is write a utility that calculates ECC and writes to
> the mtd device in RAW mode. So to rewrite the bootloader I take care of
> the ECC and layout at application level without changing the kernel.
>
Note that the kernel raw mode doesn't write the page in one time : it write data
and then ecc. This may cause problem with NOP1 nand.
see http://lists.infradead.org/pipermail/linux-mtd/2010-August/031262.html
Matthieu
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next prev parent reply other threads:[~2011-10-28 10:40 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-28 9:42 [RFC] Change ECC algorithm from userspace Javier Martinez Canillas
2011-10-28 9:42 ` Javier Martinez Canillas
2011-10-28 10:30 ` Matthieu CASTET
2011-10-28 10:30 ` Matthieu CASTET
2011-10-28 11:10 ` Javier Martinez Canillas
2011-10-28 11:10 ` Javier Martinez Canillas
2011-10-28 11:51 ` Matthieu CASTET
2011-10-28 11:51 ` Matthieu CASTET
2011-10-28 12:00 ` Javier Martinez Canillas
2011-10-28 12:00 ` Javier Martinez Canillas
2011-10-31 9:02 ` Florian Fainelli
2011-10-31 9:02 ` Florian Fainelli
2011-10-28 10:33 ` Jon Povey
2011-10-28 10:33 ` Jon Povey
2011-10-28 10:40 ` Matthieu CASTET [this message]
2011-10-28 10:40 ` Matthieu CASTET
2011-10-28 11:13 ` Javier Martinez Canillas
2011-10-28 11:13 ` Javier Martinez Canillas
2011-11-01 4:18 ` DaVinci NAND writing utility release, was: " Jon Povey
2011-11-01 4:18 ` Jon Povey
2011-11-01 10:34 ` Javier Martinez Canillas
2011-11-01 10:34 ` Javier Martinez Canillas
2011-10-31 8:04 ` Ricard Wanderlof
2011-10-31 8:04 ` Ricard Wanderlof
2011-10-28 10:43 ` Atlant Schmidt
2011-10-28 10:43 ` Atlant Schmidt
2011-10-28 11:13 ` Angus CLARK
2011-10-28 11:21 ` Javier Martinez Canillas
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